Neptune Solar Collecting Post Cap with Accessory Connection by LMT Mercer

Neptune Solar Collecting Post Cap with Accessory Connection by LMT Mercer

Neptune Solar Collecting Post Cap with Accessory Connection by LMT Mercer

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Starting at: $20.99

The final product price may change based on the combination of size/type/finish/style you choose.

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 Budget Friendly   Solar Options  Customizable

LMT Mercer Group offers a variety of budget-friendly deck lighting products... Learn More



LMT Mercer's Solar Collecting Post Caps allow you to install side-mount or under-mount lighting without a transformer! The solar collecting cap includes a 600 mAh battery and a female accessory connection which attaches to the solar light of your choice or a 2' harness extension (sold separately). Connection wires from the solar collecting cap to the light fixture(s) are hidden within your post sleeve and rails for a completely professional look. For convenient installation, the cap includes mounting templates for all three styles of lights offered by LMT. Please note: this cap acts as a power source and is not itself a post cap light.

The Neptune Solar Collecting Post Cap has curved edges and a tiered look with an unobtrusive 2-1/4" square solar panel at the top. It is available in four standard colors and six premium colors and fits 4" 5" or 6" post sleeves.
Solar lights and wiring components are sold separately.

LMT Mercer Group Sample Colors
Not sure what color to choose?
Use color samples to try before you buy. Call us toll-free at 1-888-824-5316, or click here to request color samples.

Unsure about your size? Post caps are meant to fit over the post, so it is important to measure your posts carefully to ensure a proper fit.

Product Specifications

ColorsStandard Colors: Almond, Beige, Khaki, White
Premium Colors: Antique Brown, Antique Copper, Antique Gold, Antique Gray, Black Hammertone, Patina
Pack SizeEach
Post Cap Opening Size4-1/16", 5-1/16", 6-1/16"
Material TypeVinyl
(width x depth x height)
4-1/16" = 6" x 6" x 2-1/8"
5-1/16" = 7-1/4" x 7-1/4" x 2-1/4"
6-1/16" = 7-1/4" x 7-1/4" x 2-1/4"
Inset Measurement 1/2"
Package Contents(1) post cap with (1) 600 mAh 3 volt battery and female accessory connection, installation instructions
Compatible Solar LightsSolar Dome Side Light, Solar Stair/Side Light with 2 Covers, Solar LED Under Rail Light
WarrantyView LMT Warranty Information

Additional Information

Additional Information

DD # 6460
Manufacturer LMT Mercer Group

Solar Installation Instructions  (513 KB) 


LMT Mercer Group logo

LMT Mercer Group offers a variety of budget-friendly deck lighting products. Founded in 1987, their LED and solar technologies are constantly under development in order for consumers to get the latest and greatest lights at an affordable price. The majority of LMT’s products are made in the United States.


authorized retailer

LMT Mercer Group’s mission is to be an industry leader while fostering a customer-focused approach to their designs. New products are developed based on ideas and suggestions from homeowners and builders. Their LED lights use little electricity due to their low voltage design, while their solar lights harness the sun’s energy to burn bright all night.


LMT Mercer Group offers a wide range of budget-friendly and easy-to-install post caps and deck lighting, available here at



Features and Benefits
 Budget Friendly This brand offers products designed with cost-effectiveness in mind.
 Solar Powered Options Select products use solar power from the sun's rays instead of traditional electricity. Performance and output quality varies based on placement and exposure to direct sunlight.
  Easily Customizable This brand offers a wide variety of designs and finishes for expressing your unique style.
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